From 4c9b7f3c21ff21c199e54bfad2fdf3445fa4573d Mon Sep 17 00:00:00 2001 From: Carmelo Amoroso Date: Tue, 3 Jan 2012 19:09:56 +0100 Subject: libc: allow to backtrace out of abort call Build raise and abort function with dwarf2 info by using -fasynchronous-unwind-tables to make backtrace() working across a call to abort. A scenario where it could be useful is within a signal handler that wants to dump a backtrace when catching some signal (i.e SIGABRT). Without having abort & raise built with DWARF2 information, it is not possible for the libgcc stack unwinder to walk through the call stack out of the abort/raise function. Impacts in terms of size are really limited Current text data bss dec hex filename 164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os 164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS 220 24 4 248 f8 ./libc/stdlib/abort.os With (-fasynchronous-unwind-tables) text data bss dec hex filename 216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os 216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS 280 24 4 308 134 ./libc/stdlib/abort.os Signed-off-by: Carmelo Amoroso Acked-by: Bernhard Reutner-Fischer --- libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch | 2 ++ 1 file changed, 2 insertions(+) (limited to 'libpthread/nptl/sysdeps/unix/sysv') diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch index e28cec247..b32bc9b5e 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch @@ -128,6 +128,8 @@ CFLAGS-timer_gettime.c = -I$(top_srcdir)librt -DIS_IN_librt CFLAGS-timer_routines.c = -I$(top_srcdir)librt -DIS_IN_librt CFLAGS-timer_settime.c = -I$(top_srcdir)librt -DIS_IN_librt +CFLAGS-raise.c = -fasynchronous-unwind-tables + CFLAGS-linux = -DNOT_IN_libc -DIS_IN_libpthread $(SSP_ALL_CFLAGS) CFLAGS-OMIT-libc_pthread_init.c = -DNOT_IN_libc -DIS_IN_libpthread -- cgit v1.2.3